/Engine/Source/Runtime/Projects/Public/Interfaces/IPluginManager.h
Finds all plugin descriptors underneath a given directory (recursively)
void FindPluginsUnderDirectory ( const [FString](API\Runtime\Core\Containers\FString) & Directory, [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & OutPluginFilePaths )